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BENEFIT PLANS: Expected future benefit payments and prescription drug benefits (Details) - Postretirement Benefits
$ in Thousands
Dec. 31, 2025
USD ($)
Defined Benefit Plan Disclosure  
Defined Benefit Plan, Expected Future Benefit Payments in Year One $ 4,855
Defined Benefit Plan, Expected Future Benefit Payments in Year Two 4,715
Defined Benefit Plan, Expected Future Benefit Payments in Year Three 4,620
Defined Benefit Plan, Expected Future Benefit Payments in Year Four 4,580
Defined Benefit Plan, Expected Future Benefit Payments in Year Five 4,511
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter $ 21,157